In 1978 GM downsized its popular lineup of intermediate models and while still rear wheel drive, they also had substantially less horsepower and torque than previous models owing to growing emissions and fuel economy concerns. In 1986 starting with the 305 cubic inch V-8, they increased the compression, added a hotter cam and larger diameter exhaust with the higher flow catalytic converter from the Corvette® to get a respectable 175 horsepower rating. With the revised 3.42:1 rear axle ratio, the 0 to 60 mph times decreased down to the low 9 second range. These mechanical improvements were wrapped in a stylish body with an all-new aerodynamic friendly nose, unique to the model.
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